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Merge pull request #461 from pedro-stanaka/fix/histogram-and-counters-clash

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Counter with histogram suffix will clash with histogram
This commit is contained in:
Matthias Rampke 2022-09-13 14:43:11 +00:00 committed by GitHub
commit edaa33860e
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2 changed files with 96 additions and 4 deletions
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75
pkg/exporter/exporter_test.go
View file

@ -401,6 +401,76 @@ func TestConflictingMetrics(t *testing.T) {
},
},
},
{
name: "histogram vs counter with count suffix",
expected: []float64{2},
in: event.Events{
&event.ObserverEvent{
OMetricName: "histogram_test1",
OValue: 2,
},
&event.CounterEvent{
CMetricName: "histogram_test1_count",
CValue: 1,
},
},
},
{
name: "histogram vs counter with sum suffix",
expected: []float64{2},
in: event.Events{
&event.ObserverEvent{
OMetricName: "histogram_test1",
OValue: 2,
},
&event.CounterEvent{
CMetricName: "histogram_test1_sum",
CValue: 1,
},
},
},
{
name: "histogram vs counter with bucket suffix",
expected: []float64{2},
in: event.Events{
&event.ObserverEvent{
OMetricName: "histogram_test1",
OValue: 2,
},
&event.CounterEvent{
CMetricName: "histogram_test1_bucket",
CValue: 1,
},
},
},
{
name: "histogram vs gauge with sum suffix",
expected: []float64{2},
in: event.Events{
&event.ObserverEvent{
OMetricName: "histogram_test1",
OValue: 2,
},
&event.GaugeEvent{
GMetricName: "histogram_test1_sum",
GValue: 1,
},
},
},
{
name: "histogram vs gauge with count suffix",
expected: []float64{2},
in: event.Events{
&event.ObserverEvent{
OMetricName: "histogram_test1",
OValue: 2,
},
&event.GaugeEvent{
GMetricName: "histogram_test1_count",
GValue: 1,
},
},
},
{
name: "counter vs histogram",
expected: []float64{1},
@ -520,10 +590,11 @@ mappings:
events <- s.in
close(events)
}()
ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
reg := prometheus.NewRegistry()
ex := NewExporter(reg, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
metrics, err := prometheus.DefaultGatherer.Gather()
metrics, err := reg.Gather()
if err != nil {
t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
}

25
pkg/registry/registry.go
View file

@ -19,6 +19,7 @@ import (
"hash"
"hash/fnv"
"sort"
"strings"
"time"
"github.com/prometheus/client_golang/prometheus"
@ -165,6 +166,11 @@ func (r *Registry) GetCounter(metricName string, labels prometheus.Labels, help
return nil, fmt.Errorf("metric with name %s is already registered", metricName)
}
err := r.checkHistogramNameCollision(metricName)
if err != nil {
return nil, err
}
var counterVec *prometheus.CounterVec
if vh == nil {
metricsCount.WithLabelValues("counter").Inc()
@ -181,7 +187,6 @@ func (r *Registry) GetCounter(metricName string, labels prometheus.Labels, help
}
var counter prometheus.Counter
var err error
if counter, err = counterVec.GetMetricWith(labels); err != nil {
return nil, err
}
@ -190,6 +195,18 @@ func (r *Registry) GetCounter(metricName string, labels prometheus.Labels, help
return counter, nil
}
func (r *Registry) checkHistogramNameCollision(metricName string) error {
histogramSuffixes := []string{"_bucket", "_count", "_sum"}
for _, suffix := range histogramSuffixes {
if strings.HasSuffix(metricName, suffix) {
if r.MetricConflicts(strings.TrimSuffix(metricName, suffix), metrics.CounterMetricType) {
return fmt.Errorf("metric with name %s is already registered", metricName)
}
}
}
return nil
}
func (r *Registry) GetGauge(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Gauge, error) {
hash, labelNames := r.HashLabels(labels)
vh, mh := r.Get(metricName, hash, metrics.GaugeMetricType)
@ -201,6 +218,11 @@ func (r *Registry) GetGauge(metricName string, labels prometheus.Labels, help st
return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
}
err := r.checkHistogramNameCollision(metricName)
if err != nil {
return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
}
var gaugeVec *prometheus.GaugeVec
if vh == nil {
metricsCount.WithLabelValues("gauge").Inc()
@ -217,7 +239,6 @@ func (r *Registry) GetGauge(metricName string, labels prometheus.Labels, help st
}
var gauge prometheus.Gauge
var err error
if gauge, err = gaugeVec.GetMetricWith(labels); err != nil {
return nil, err
}